Scientist Mara Cadell created the Twin-Bred -- pairs of fraternal twins, one human and one Tofa -- to bridge the profound and dangerous gap between the human colonists on Tofarn and the indigenous Tofa. Unexpectedly, it is the Tofa host mothers who now claim the capacity to bring peace between the two. The Twin-Bred themselves have been forced to abandon their mission and their planet, in the hope of finding a less hostile home. Only one pair remain behind, seeking to build new and separate lives with their own kind. But Mara and the Twin-Bred should know by now that plans provide little...